Update Dokka to 1.9.20

[whyoleg]

No issues comparing to Dokka 1.9.10. knit tasks works

[dkhalanskyjb]

The changes seem beneficial; only one place caught my eye. In kotlinx-coroutines-debug/build/dokka/htmlPartial/kotlinx.coroutines.debug/-debug-probes/print-job.html, in the old version, there's an <a href for the Job reference, but with the new version, there's some <dokka-template-command instead. Is this expected?

[whyoleg]

htmlPartial tasks outputs are not relevant and could change from release to release, as they are like intermediate partial result of Dokka for single module in multi-module projects.
So yes, something could change there. Most likely in this case, resolving of the links was changed (and most likely fixed) as per Kotlin/dokka#2272 - as in kotlinx.coroutines there is exists the same package in both core and debug artefact.

If you still do want to check the difference, it will be more correct to check multi-module result which is produced in build/dokka/htmlMultiModule

[dkhalanskyjb]

Oh, I see, thanks! Didn't know about these fine details. Looking briefly at dokka/htmlMultiModule, I do indeed see nothing suspicious.